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Title: Constraints on pdf uncertainties from CDF

Abstract

Recent electroweak measurements and jet physics results from CDF which constrain the parton density functions (PDFs) are presented. Measurements of the W charge asymmetry, W and Z as well as jet cross sections based on k{sub T} and midpoint algorithm with up to 1 fb{sup -1} RunII data are discussed.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
899696
Report Number(s):
FERMILAB-CONF-06-263-E
TRN: US200711%%85
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: Presented at 14th International Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, 20-24 Apr 2006
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALGORITHMS; ASYMMETRY; CROSS SECTIONS; DEEP INELASTIC SCATTERING; FERMILAB COLLIDER DETECTOR; PHYSICS; Experiment-HEP

Citation Formats

Issever, C., and /Oxford U. Constraints on pdf uncertainties from CDF. United States: N. p., 2006. Web.
Issever, C., & /Oxford U. Constraints on pdf uncertainties from CDF. United States.
Issever, C., and /Oxford U. Sat . "Constraints on pdf uncertainties from CDF". United States. doi:. https://www.osti.gov/servlets/purl/899696.
@article{osti_899696,
title = {Constraints on pdf uncertainties from CDF},
author = {Issever, C. and /Oxford U.},
abstractNote = {Recent electroweak measurements and jet physics results from CDF which constrain the parton density functions (PDFs) are presented. Measurements of the W charge asymmetry, W and Z as well as jet cross sections based on k{sub T} and midpoint algorithm with up to 1 fb{sup -1} RunII data are discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}

Conference:
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  • The rapidity distributions of W and Z bosons produced in proton anti-proton collisions at CDF are presented. The rapidity distribution of Z bosons, measured for the first time over the entire kinematic range, is better described by NLO QCD (and also by QCD with gluon resummation) than by leading order QCD. The W charge asymmetry data as a function of rapidity strongly constrain the ratio of d and u quark momentum distributions in the proton over the x range of 0.006 to 0.34. The W data are used to rule out recently proposed models for charge and flavor symmetry violationmore » of the sea quark distributions in the nucleon.« less
  • The asymmetry in W{sup -} - W{sup +} production in p{bar p} collisions and Drell-Yan data place tight constraints on parton distributions functions. The W asymmetry data constrain the slope of the quark distribution ratio d(x)/u(x) in the x range 0.007-0.27. The published W asymmetry results from the CDF 1992.3 data ({approx} 20 pb{sup -1}) greatly reduce the systematic error originating from the choice of PDF`s in the W mass measurement at CDF. These published results have also been included in the CTEQ3, MRSA, and GRV94 parton distribution fits. These modern parton distribution functions axe still in good agreement withmore » the new 1993-94 CDF data({approx} 108 pb{sup -1} combined). Preliminary results from CDF for the Drell-Yan cross section in the mass range 11-350 GeV/c{sup 2} are discussed.« less
  • We apply a method proposed by members of CTEQ Collaboration to estimate the uncertainty in associated W-Higgs boson production at Run II of the Tevatron due to our imprecise knowledge of parton distribution functions. We find that the PDF uncertainties for the signal and background rates are of the order 3%. The PDF uncertainties for the important statistical quantities (significance of the Higgs boson discovery, accuracy of the measurement of the WH cross section) are smaller (1.5%) due to the strong correlation of the signal and background.
  • I discuss how global QCD fits of parton distribution functions can make the somewhat separated fields of high-energy particle physics and lower energy hadronic and nuclear physics interact to the benefit of both. In particular, I will argue that large rapidity gauge boson production at the Tevatron and the LHC has the highest short-term potential to constrain the theoretical nuclear corrections to DIS data on deuteron targets necessary for up/down flavor separation. This in turn can considerably reduce the PDF uncertainty on cross section calculations of heavy mass particles such as W' and Z' bosons.